Shortcut dialing apparatus for telephone set

ABSTRACT

A shortcut dialing apparatus for a telephone set is disclosed. The apparatus includes a plurality of ROMs for storing telephone numbers therein, a plurality of ROM cards including a corresponding ROM among the ROMs and electrically and detachably being engaged with a main body, a ROM card receiving unit formed in the main body for receiving the ROM card therein, a plurality of selection switches for selectively outputting the telephone number stored in the ROMs, a CPU for scanning the selection switch pushed by a user among the selection switches and outputting a data corresponding to the telephone number stored in the ROM, a DTMF signal generator for outputting a DTMF signal corresponding to the data, and a speaker for receiving the DTMF signal and outputting a sound for thereby detachably installing a ROM card with a ROM into a main body, storing a plurality of telephone numbers into the ROM, and transmitting a corresponding telephone number based on a one-touch operation of the button.

TECHNICAL FIELD

The present invention relates a shortcut dialing apparatus for atelephone set, and in particular to a shortcut dialing apparatus for atelephone set which is capable of storing a telephone number into adetachable ROM card, and reading the thusly stored telephone number fromthe ROM card in which the telephone number is stored based on aone-touch operation.

BACKGROUND ART

As the number of telephone numbers that people should memory isincreased, since it is difficult to correctly memory the telephonenumbers, a person writes down the number on paper. When dialing thetelephone set, the person dials with his/her one hand holding the paperon which the telephone number is written for thereby causing muchinconveniences for using the telephone set.

In order to overcome the above-described problems, a telephone set witha shortcut dialing function is disclosed. This telephone set is capableof implementing a dialing operation based on a one-touch method withoutpushing a plurality of numbers. In order to implement theabove-described short-cut dialing operation, a memory unit is installedin a telephone set main body for thereby storing the telephone numbers.When a user pushes a predetermined button, the storing mode is set.Thereafter, the user pushes corresponding numbers, and then the storingcompletion button is pushed for thereby completing a telephone numberstoring operation. In this state, when the user pushes a correspondingshortcut button, the telephone number corresponding to the shortcutbutton is transmitted for thereby implementing a desired communication.

The conventional shortcut dialing function is directed to implement acommunication by pushing a corresponding button at one time withoutmemorizing a plurality of numbers. However, in this function, it isdifficult to use.

Namely, the button operation sequences are different for using theshortcut function based on the fabrication companies. In order totransmit the previously stored telephone numbers, it is difficult toknow how to operate the shortcut buttons. For example, assuming that auser stores the telephone number of a restaurant as 1, the telephonenumber of a door-to-door delivery service company as 2, the telephonenumber of a business partner as 3, and the telephone number of a friendas 4, the user pushes a selection button for using the shortcut dialingfunction in order to call the business partner, and then pushes thebutton 3 which is designated as the telephone number of the businesspartner company, the telephone number of the business partner istransmitted. At this time, the user may forget the button whichcorresponds to the business partner. In order to prevent theabove-described problem, the user should write down the shortcuttelephone number on the paper. In this case, the earlier describedconventional problems occur. Namely, the number of the shortcuttelephone numbers is increased, it is very difficult for the user tomemory the shortcut telephone numbers.

In addition, in order to overcome the above-described problems, atelephone service technique is disclosed for the shortcut dialingfunction. For example, a plurality of telephone numbers are stored, andthen the shortcut dialing apparatus is distributed to the users. Theuser connects the shortcut dialing apparatus to the telephone set usinga wire, and then the user pushes a corresponding shortcut button forthereby transmitting a corresponding telephone number related to theshortcut button. However, since the shortcut dialing apparatus has alimited number of the telephone numbers stored, it is impossible to useit for a large scale company. In addition, since it is impossible tostore the telephone numbers that a user wishes to store, the shortcutdialing apparatus may not be used for a personal use. Furthermore, thepurpose of the use of the same is limited. In this case, the user shouldbe charged of the rate of the telephone services.

DISCLOSURE OF THE INVENTION

Accordingly, it is an object of the present invention to provide ashortcut dialing apparatus for a telephone set which overcomes theaforementioned problems encountered in the background art.

It is another object of the present invention to provide a shortcutdialing apparatus for a telephone set which is capable of detachablyinstalling a ROM card with a ROM, in which telephone numbers are stored,into a main body for thereby transmitting a telephone number stored inthe ROM.

It is another object of the present invention to provide a shortcutdialing apparatus for a telephone set which is capable of detachablyinstalling a ROM card with a ROM into a main boy, storing a plurality oftelephone numbers into the ROM, and transmitting a correspondingtelephone number based on a one-touch operation of the button.

In order to achieve the above objects, there is a provided a shortcutdialing apparatus for a telephone which includes a plurality of ROMs forstoring telephone numbers therein, a plurality of ROM cards including acorresponding ROM among the ROMs and electrically and detachably beingengaged with a main body, a ROM card receiving unit formed in the mainbody for receiving the ROM card therein, a plurality of selectionswitches for selectively outputting the telephone number stored in theROMs, a CPU for scanning the selection switches pushed by a user amongthe selection switches and outputting a data corresponding to thetelephone number stored in the ROM, a DTMF signal generator foroutputting a DTMF signal corresponding to the data, and a speaker forreceiving the DTMF signal and outputting a sound.

Additional advantages, objects and features of the invention will becomemore apparent from the description which follows.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will become more fully understood from thedetailed description given hereinbelow and the accompanying drawingswhich are given by way of illustration only, and thus are not limitativeof the present invention, and wherein:

FIG. 1 is a block diagram illustrating a shortcut dialing apparatus fora telephone set according to a first embodiment of the presentinvention;

FIG. 2 is a view illustrating a shortcut dialing apparatus according tothe present invention;

FIG. 3 is a view illustrating a ROM card and a ROM card receiving unitof FIG. 2 according to the present invention;

FIG. 4 is a circuit diagram illustrating a shortcut dialing apparatusfor a telephone set according to a second embodiment of the presentinvention;

FIG. 5 is a perspective view illustrating a shortcut dialing apparatusfor a telephone set according to a second embodiment of the presentinvention; and

FIG. 6 is a block diagram illustrating a shortcut dialing apparatus fora telephone set according to a third embodiment of the presentinvention.

MODES FOR CARRYING OUT THE INVENTION

FIG. 1 is a block diagram illustrating a shortcut dialing apparatusaccording to a first embodiment of the present invention which includesROMs 11A through 11D for storing a plurality of telephone numbers andoutputting a corresponding telephone number when a user selects thesame, a demultiplexer 12 for selectively supplying chip selectionsignals CS1 through CS4 to a corresponding ROM in order to read atelephone number from the ROM selected among the ROMs 11A through 11D bythe user, selection switches SW1 through SW4 for selectively outputtinga telephone number selected by the user among the telephone numbersstored in the ROMs 11A through 11D, a CPU 13 for scanning a buttonpushed by the user among the selection switches SW1 through SW4,supplying the chip selection signal CS to the demultiplexer 12 in orderto output a telephone number stored in a corresponding ROM among theROMs 11A through 11D, and transferring the outputted telephone number toa DTMF signal generator 14, a DTMF signal generator 14 for convertingthe telephone number from the CPU 13 into the DTMF signal and amplifyingthe thusly converted signal to a predetermined level, and a speaker 15for transferring the DTMF signals sequentially outputted from the DTMFsignal generator 14 to the handset side of the telephone set.

FIG. 2 is a view illustrating the shortcut dialing apparatus accordingto the present invention. The ROMs 11A through 11D are detachablyinstalled in the ROM cards 21A through 21D. A plurality of ROM cardreceiving units 22A through 22D are installed into the main body 20 forslidably installing the ROM cards 21A through 21D. A groove is formed ineach of the ROM card receiving units 22A through 22D. The selectionswitches SW1 through SW4 are installed at the portions corresponding tothe ROM cards for selecting a corresponding ROM card in which thetelephone number is stored. In addition, The ROM cards 21A through 21Dare formed in a thin card shape for a slidable installation. A groove isformed at each of the ROM card receiving units 22A through. 22D forreceiving a thin card-shaped ROM card thereinto.

FIG. 3 is a view illustrating a ROM card and a ROM card receiving unitof FIG. 2 according to the present invention. As shown therein, aplurality of contact pins 31 are elastically engaged with the ROM cardreceiving units 22A through 22D. The contact pin 31 is exposed at aportion corresponding with the input/output terminal 32 of the ROM andis elastically connected with the input/output terminal 32 of the ROMwhen the ROM cards 21A through 21D are received in the ROM cardreceiving units 22A through 22D for thereby forming a circuit as shownin FIG. 1.

In addition, a predetermined information may be written on the surfaceof the ROM cards 21A through 21D, so that the user writes down apredetermined information such as the telephone numbers of asupermarket, a restaurant, hospital, company, etc. thereon for therebyeasily checking a corresponding ROM card in which a telephone numberthat the user wishes to know is stored. The ROM card with the telephonenumbers may be stored in the ROM card receiving box 23 or may be storedat a predetermined location.

The operation of the shortcut dialing apparatus according to the presentinvention will be explained.

When a user inserts the ROM card containing a predetermined telephonenumber from the ROM card receiving box 23 or a predetermined positioninto the ROM card receiving units 22A through 22D, the contact pin 31and the input/output terminal 32 of the ROM elastically contact, so thatthe ROMs 11A through 11D installed in the ROM card form an electricalconnection as shown in FIG. 1.

In this state, when the user contacts the handset of the telephone withthe speaker 15, and pushes a predetermined switch among the selectionswitches SW1 through SW4, a predetermined voice corresponding to thetelephone number stored in the selected ROM is transferred to thetelephone through the handset, so that a corresponding telephone numberis automatically transmitted from the telephone set to the switch unit.

For example, assuming that a restaurant telephone number is stored inthe ROM 11A of the ROM card 21A, and a user wishes to call therestaurant, the handset of the telephone set is contacted with thespeaker 15, and the selection switch SW1 installed near the ROM card 21Ais pushed.

At this time, the CPU 13 scans that the selection switch SW1 is turnedon, and outputs a read enable signal EN to the ROMs 11A through 11D forreading the telephone number of the restaurant stored in the ROM 11A ofthe ROM card 21A and outputs a switching control signal SC and a chipselection signal CS through the bus BUS2. The demultiplexer selected achip selection signal CS1 by the switching control signal SC and outputsthe selected chip selection signal CS1 to the ROM 11A.

The ROM 11A is selected among the ROMs 11A through 11D, and the datacorresponding to the telephone number of the restaurant stored in theROM 11A is read and then is outputted to the CPU 13 through the data busBUS1.

The CPU 13 outputs the data to the DTMF signal generator 14, and theDTMF signal generator 14 outputs a DTMF signal based on the inputteddata, and then the signal is transmitted to the switch unit through thehandset of the telephone set and the telephone line.

Therefore, the user can implement a communication by calling therestaurant by pushing the switch at one time without pushing apredetermined number of the telephone numbers of the restaurant.

In the above-described embodiment of the present invention, the casethat four ROM cards 21A through 21D are installed. The number of the ROMcards is not limited thereto. In addition, the main body 20 may beformed in a predetermined shape. In the above description, the functionfor selecting the ROMs 11A through 11D is performed by the demultiplexer12, and the DTMF signal is generated by the DTMF signal generator 14.However, the functions of the demultiplexer 12 and the DTMF signalgenerator 14 may be performed by the CPU 13.

The second embodiment of the present invention will be explained.

FIG. 4 is a block diagram illustrating the shortcut dialing apparatusaccording to the present invention. As shown therein, the connectionunit 41 includes a modular jack MDJ and bridge diodes D1 through D4, andthe modular jack MDJ connects the apparatus with the local lines L1 andL2. In addition, the telephone set connected with the local lines L1 andL2 are not shown in the drawing. When a hook switch of the telephone setis enabled, the local line voltage is inputted through the modularjack(MDJ). The constant voltage generator 42 includes first and secondresistors R1 and R2 which divide the local line voltage, and a zenerdiode ZD and condensers C1 and C2 connected in parallel with the secondresistor R2 for generating a constant voltage. The local line voltage isdivided by the first and second resistors R1 and R2 through the bridgediode D2. The voltage applied to the second resistor R2 through isconverted into the constant voltage by the zener diode ZD, and twocondensers C1 and C2 and is used as a power source VCC for driving theapparatus according to then present invention. In addition, the localline voltage is used as a power for driving the telephone set since thepower source VCC is small in proportion to the size of the local linevoltage, the voltage does not affect the driving power of the telephoneset.

The CPU 43 is driven by the power source VCC and controls each element.The switch matrix 44 is connected with the CPU 43 and generates apredetermine signal in accordance with the switch operation by the user.The switches K0 through K9 are the number switches for inputting thetelephone numbers when storing the telephone numbers and performing ashortcut dialing function when transmitting the stored telephone number.The switch KSEC is a setting/completion switch for setting the system tothe storing mode or the transmission mode. The remaining switches KM1through KM11 are the shortcut switches for performing a shortcut dialfunction.

The first memory unit 45 includes a plurality of ROMs X0 through X9, andeach of the ROMs X0 through X9 is capable of storing the data thereincorresponding to the telephone number and includes four terminals VC,VS, DA and DB for implementing an electrical connection with the CPU 43.The terminal VC is the terminal for receiving the enable signal from theCPU 43, and the terminal VS is connected with the ground, and theterminals DA and DB are used for a serial communication with the CPU andare connected with the CPU 43 through the serial communication bus BUS1.Four terminals VC, VS, DA and DB are used for implementing thedetachable installations of the ROMs X0 through X9.

When the enable signals EN0 through EN9 are inputted from the CPU 43,the enabled ROMs X0 through X9 output the data corresponding to thetelephone numbers installed in the interior, and the thusly outputteddata are transferred to the CPU through the terminals DA and DB and theserial communication bus BUS1. In addition, the 10th ROM X9 among tenROMs X0 through X9 stores the data in accordance with an enable signalEN9 from the CPU 43, and the remaining ROMs X0 through X8 output thepreviously stored data.

Namely, nine ROMs among ten ROMs read the data, and the remaining oneROM reads/writes the data for the reason that the use can easily use thesystem. In addition, the ROM is EEPROM which is capable of reading andwriting the data.

The second memory unit 46 includes one ROM X10, and a plurality oftelephone numbers are stored in the ROM X10. When fabricating theapparatus according to the present invention, the telephone numbers, forexample 10 telephone numbers, are stored therein for therebyimplementing a read/write operation of the telephone numbers by theswitch KSEC.

When the user pushes the shortcut switches KM1 through KM11, the CPU 43outputs an enable signal EN10, and one telephone number is selectedamong 11 telephone numbers stored in the ROM X10, and the datacorresponding to the telephone number is transferred to the CPU 43through the serial communication bus BUS1.

The DTMF driving unit 47 outputs a DTMF signal when the CPU 43 outputs avoltage to the DTMF terminal and includes a switching transistor Q, aresistor R6 between the DTMF terminal of the CPU 43 and the switchingtransistor Q, and a resistor R7 between the emitter of the switchingtransistor Q and the ground.

The ground of the bridge diodes D1 through D4 of the connection unit 31,the resistor R2 of the constant voltage generator 42, and the zenerdiode ZD, and the condenser C1, and the ground of the resistor R7 of theDTMF driving unit 47 are connected. In addition, in order to prevent theDTMF signal from the resistor R7 from being dropped below the level 0,the resistor R4 and the diode D1 are connected in parallel between theground connected with the resistor R7 and another ground for therebyimplementing an increased stable level of the DTMF signal.

The display unit 48 includes a LED connected between the power sourceVCC and the CPU 43 for emitting light in accordance with a switchoperation of the user, and a buzzer BUZZ connected between the powersource VCC and the CPU 43 for generating a sound in accordance with aswitch operation of the user.

FIG. 5 is a perspective view illustrating the shortcut dialing apparatusaccording to the second embodiment of the present invention. As showntherein, a modular jack MDJ is installed at the upper portion of themain body 20, and the input terminal IN is connected with the local linefrom the switch unit, and the output terminal OUT is connected with thetelephone set. A plurality of shortcut switches KM1 through KM11 and asetting/completion switch MSEC are installed at a lower portion of theupper panel of the main body 20. A plurality of ROM card receiving units210 through 219 are installed on the upper surface of the main body 20,and a plurality of ROM cards 220 through 229 are slidably received intothe ROM card receiving units 210 through 219. The ROMs X0 through X9 areinstalled in the ROM cards 220 through 229. The number switches K0through K9 are installed beside the ROM card receiving units 210 through219. The LED is installed at a lower portion of the upper surface of themain body 20.

A plurality of contact pins are formed in the ROM card receiving units210 through 219 in the same manner as the method of the first embodimentof the present invention. In a state that the ROM cards 220 through 229are inserted into the ROM card receiving units 210 through 219, fourterminals VC, CS, DA and DB of the ROMs X0 through X9 of FIG. 4 contactwith the contact pins for thereby implementing an electrical contactbetween the ROMs X0 through X9 and the CPU.

Next, the operation of the second embodiment of the present inventionwill be explained based on the switch operation of the user.

The operation will be explained based on the following operations.Namely, the operation for inputting the telephone numbers into the ROMsX0 through X9 and the operations for transmitting the stored telephonenumbers in the state that the telephone numbers are stored in the ROMsX0 through X9.

[Telephone number storing operation]

When the user picks up the handset, the local power is inputted into themodular jack MDJ of the connection unit 41 through the local lines L1and L2. The local line power is divided by the resistors R1 and R2 ofthe constant voltage generation unit 42, and the thusly divided voltagedrives the CPU 43.

When the setting/completion switch KSEC is pushed by the user, the CPU43 outputs a read enable signal, and the read enable signal EN9 isapplied to the 10th ROM X9 through the 10th terminal VC. The 10th ROM X9is write-enabled. The CPU 43 changes the voltage level of the terminalP6.0 for thereby turning on/off the LED. Therefore, the user recognizesthat it is ready to store the telephone numbers. The 10th ROM X9 isenabled for the reason that the telephone number is stored into the ROMX9 corresponding to the ROM card 229 inserted into the lowest receivingunit 219 among 10 ROM card receiving units 210 through 219 of FIG. 5 foruniformly arranging the enabled states of the ROMs into which thetelephone numbers are stored for thereby preventing any confusion whenthe user uses the apparatus.

When the user sequentially pushes the switches corresponding to thetelephone numbers among 10 number switches K0 through K9, and pushes thesetting/completion switch KSEC, the CPU 43 outputs the datacorresponding to the number switches K0 through K9, and the thuslyoutputted data is stored into the 10th ROM X9 enabled via the serialcommunication bus BUS1. At this time, the CPU turns off the LED, changesthe voltage level of the terminal P5.1 and causes the BUZZ to output asound, so that the user can recognize that the storing operation of thetelephone number is completed.

The user can write the information such as the telephone number, thename of the business partner, the name of a person, the name of thecompany, etc. on the upper surface of the ROM card. Therefore, it ispossible to correctly confirm the telephone number of a correspondingperson or company.

[Telephone number transmission]

The user inserts the ROM cards 220 through 229 having the ROMs X0through X9 therein into the ROM card receiving units 210 through 219.For example, the ROM card having the telephone number that the userwishes to call is inserted into the second ROM card receiving unit 211,and then the user picks up the handset and pushes the second numberswitch K1 beside the second ROM card receiving unit 211. In this case,the CPU 43 outputs the enable signal EN1 to the second ROM X1, and thedata stored in the second ROM X1 is inputted into the CPU 43 through theserial communication bus BUS1. The CPU 43 outputs a DTMF signal having apredetermined level to the DTMF terminal, and the DTMF signal istransferred to the telephone set through the transistor Q, the resistorR4, the ground, the diode D3 of the connection unit 41, the modular jackMDJ, and the line L12. As a result, the telephone set attempts a callwith the switch unit.

In addition, The setting/completion switch KSEC is divided into shorttime pushing operation and a long time pushing time operation, so thatit is possible to store two telephone numbers into one ROM. Therefore,the CPU 43 outputs divided enable signals to the ROMs X0 through X9 ofthe first memory unit 45. If the user pushes the setting/completionswitch KSEC for a short time or long time, the CPU recognizes whetherthe setting/completion switch KSEC is pushed for a short time or a longtime and outputs one enable signal between two enable signals. In theinterior of the enabled ROM, the memory regions are divided andallocated. The user stores the telephone number into the selected ROM bysequentially pushing the telephone numbers in the same manner as theabove-described method. Thereafter, the setting/completion switch KSECis pushed. The user records two cases in which one case corresponds towhen the telephone number is pushed for a long time, and the other casecorresponds to when the telephone number is pushed for a long time,whereby the user can recognize a predetermined telephone number shouldbe transmitted among two telephone numbers. Namely, when transmittingthe telephone number, the user picks up the handset and pushes thenumber switch near the ROM card for a short time or a long time forthereby recognizing when the setting/completion switch is pushed for ashort time or long time.

When completing the storing operation, the operation is divided into thecase that the setting/completion is pushed for a short time and the casethat the same is pushed for a long time for thereby updating thepreviously stored telephone number to another telephone number. Afterthe telephone number storing operation is completed, in order tocomplete the telephone number storing operation, the setting/completion,switch is pushed. In this case, if the setting/completion switch KSEC ispushed for a short time, the CPU 43 recognizes the short time push andoutputs an enable signal by which the data stored in the ROM is updatedto another data. On the contrary, if the setting/completion switch KSECis pushed for a long time, the CPU 43 outputs an enable signal by whichthe data store din the ROM is not updated to another data. Therefore,the user is capable of using a predetermined function if necessary.

A sticker may be used in order to the user to easily write down thetelephone numbers on the ROM card. The user writes a telephone number ofthe sticker, and the sticker may be attached on the ROM card. When themanufacturer provides the users with the sticker, the user uses thesticker, and is capable of easily writing the telephone number on theROM card.

FIG. 6 is a block diagram illustrating a shortcut dialing apparatusaccording to a third embodiment of the present invention.

In the first and second embodiments of the present invention, theshortcut dialing apparatus and the telephone set are separated. In thethird embodiment of the present invention, the shortcut dialingapparatus and the telephone set main body are integrally formed. Thefirst memory unit 45 as shown in FIG. 6 is the same as the first memoryunit 45 as shown in FIG. 4, and the power unit 61 generates a power fordriving each element. The connection unit 61, the power unit 63, the CPU65, the switch matrix 67, and the second memory unit 66, the DTMFdriving unit 64, and the display unit 68 are given the same referencenumerals as the embodiment shown in FIG. 4. Since the communicationdetection unit 62, the hook 70, the tone ringer 71, the speaker 72 andthe handset 69 are the same as the conventional art, the descriptionthereof is omitted.

As described above, the present invention may be used for a businesscompany which controls a plurality of users. In the present invention, apredetermined telephone number is stored into a corresponding ROM card,and then the ROM card is inserted into a corresponding ROM cardreceiving unit, so that the telephone number stored in the ROM card istransmitted by pushing a corresponding switch at one time, whereby theuser can easily use the shortcut dialing function. In addition, the usercan handle the telephone number directly inputted by the user. Inaddition, in the side of the business company, a predetermined number isstored into the ROM card, and the telephone number is written on thesticker, and the sticker is attached on one side of the ROM card, andthen the ROM card is distributed to the customers, so that the customercan easily communicate with the business company for thereby increasingthe business performance of the company.

Although the preferred embodiment of the present invention have beendisclosed for illustrative purposes, those skilled in the art willappreciate that various modifications, additions and substitutions arepossible, without departing from the scope and spirit of the inventionas recited in the accompanying claims.

What is claimed is:
 1. A shortcut dialing apparatus for a telephone set,comprising: a plurality of ROMs for storing telephone numbers therein; aplurality of ROM cards including a corresponding ROM among the ROMs andelectrically and detachably being engaged with a main body; a ROM cardreceiving unit formed in the main body for receiving the ROM cardtherein; a plurality of selection switches for selectively outputtingthe telephone number stored in the ROMs; a CPU for scanning theselection switch pushed by a user among the selection switches andoutputting data corresponding to the telephone number stored in the ROM;a DTMF signal generator for outputting a DTMF signal corresponding tothe data; and a speaker for receiving the DTMF signal and outputting asound.
 2. The apparatus of claim 1, wherein said ROM card is thin forbeing slidably received, and said ROM card receiving unit includes agroove for receiving the ROM card therein.
 3. The apparatus of claim 1,wherein a sticker on which the telephone number is written is attachedon one surface of the ROM card for recognizing the telephone numberstored in the ROM, and a predetermined character or symbol is written onthe sticker.
 4. The apparatus of claim 1, wherein said ROM cardreceiving unit includes contact pins for implementing an electricalconnection with the ROM card, and said ROM card includes an input/outputterminals for being electrically connected with the contact pins.
 5. Theapparatus of claim 1, wherein said selection switch is installed at aportion corresponding to a corresponding ROM card.
 6. A shortcut dialingapparatus for a telephone set, comprising: a connection unit connectedwith a local line and a telephone set; a constant voltage generator fordividing a local line voltage through the connection unit and generatinga power source; a plurality of ROMs for storing telephone numbers; aplurality of ROM cards including a ROM among the plurality of ROMs, saidROM cards being electrically and mechanically detachable from a mainbody; a ROM card receiving unit installed in the main body for receivingthe ROM cards; a switch matrix including a plurality of switches forselectively outputting the telephone number stored in the ROMs; a CPUfor scanning the switch pushed by the a user among the switches,receiving a data corresponding to the telephone number stored in the ROMand outputting a DTMF signal as a result of the received data; and aDTMF driving unit for transferring the DTMF signal to the connectionunit.
 7. The apparatus of claim 6, wherein the plurality of ROMs areconnected with each other and the CPU by a serial communication bus forimplementing a data transmitting and receiving operation.
 8. Theapparatus of claim 7, wherein said ROMs each includes: a first terminalfor receiving an enable signal of the CPU; a second terminal connectedwith the ground; and third and fourth terminals connected with theserial communication bus, wherein said ROM card receiving unit includescontact pins for an electrical connection with the ROM card, and thecontact pins are elastically connected with four terminals of the ROM.9. The apparatus of claim 6, wherein said connection unit includes amodular jack connected with the local line, and a bridge diode foroutputting the local line voltage to the constant voltage generator andfor transferring the DTMF signal to the telephone set.
 10. The apparatusof claim 6, wherein said constant voltage generator includes: first andsecond resistors for dividing the local line voltage; and a zener diodeand condenser connected in parallel with the second resistor forgenerating the constant voltage.
 11. The apparatus of claim 10, whereinsaid constant voltage generator includes a resistor and diode connectedin parallel between a ground connected with the second resistor, thezener diode and the condenser and another ground.
 12. The apparatus ofclaim 6, further comprising a second memory unit formed of a ROM inwhich a plurality of telephone numbers are stored, wherein said switchmatrix includes a plurality of shortcut switches, and when the shortcutswitch is pushed, the CPU outputs the DTMF signal corresponding to thetelephone number stored in the ROM of the second memory.
 13. Theapparatus of claim 6, further comprising a display unit which includes aLED and emits light when the switch is pushed, and a buzz for generatinga sound when the switch is pushed.
 14. The apparatus of claim 6, whereinsaid switches includes a setting/completion switch for setting thesystem to the storing mode or the transmission mode, and a plurality ofnumber switches, whereby the CPU stores the telephone number into theROM when the setting/completion switch is pushed, a plurality of numberswitches are sequentially pushed, and the setting/completion switch ispushed again.
 15. The apparatus of claim 14, wherein said CPU recognizesthe cases that when the setting/completion switch is pushed for a shorttime or long time for thereby allocating the memory region of the ROM.16. The apparatus of claim 14, wherein said CPU recognizes the casesthat the setting/completion switch is pushed for a short time or longtime when the setting/completion switch is pushed, for thereby the datapreviously stored in the ROM is updated to another data.
 17. A shortcutdialing apparatus for a telephone set, comprising: a plurality of ROMsfor storing telephone numbers; a plurality of ROM cards including a ROMamong the plurality of the ROMs, said ROM cards being electrically andmechanically detachable from a main body; a ROM card receiving unitinstalled in the main body for receiving the ROM cards; a switch matrixincluding a plurality of switches for selectively outputting thetelephone number stored in the ROMs; and a CPU for scanning the switchpushed among the plurality of switches by a user, receiving a datacorresponding to the telephone number stored in the ROM and outputting aDTMF signal, whereby the above-described elements are installed in thetelephone set main body.
 18. The apparatus of claim 17, wherein theplurality of ROMs are connected with each other and the CPU by a serialcommunication bus for implementing a data transmitting and receivingoperation.
 19. The apparatus of claim 18, wherein said ROMs eachinclude: a first terminal for receiving an enable signal of the CPU; asecond terminal connected with the ground; and third and fourthterminals connected with the serial communication bus, wherein said ROMcard receiving unit includes contact pins electrically connected withthe ROM card, and the contact pins are electrically connected with fourterminals of the ROM.
 20. The apparatus of claim 17, wherein saidswitches includes a setting/completion switch for setting the system tothe storing mode or the transmission mode, and a plurality of numberswitches, whereby the CPU stores the telephone number into the ROM whenthe setting/completion switch is pushed, a plurality of number switchesare sequentially pushed, and the setting/completion switch is pushedagain.
 21. The apparatus of claim 20, wherein said CPU recognizes thecases that when the setting/completion switch is pushed for a short timeor long time for thereby allocating the memory region of the ROM. 22.The apparatus of claim 20, wherein said CPU recognizes the cases thatthe setting/completion switch is pushed for a short time or long timewhen the setting/completion switch is pushed, for thereby the datapreviously stored in the ROM is updated to another data.